Here is the full list of all 34 Little Triangle trophies - there are 23 bronze, 4 silver, 6 gold and 1 platinum.
Unlock All Trophies
Tutorial completed
Every single Diamond
100 kills
500 kills
50 combo in credits screen
Every single money bag
10000 Diamonds
Jump right on the surface of lava
All secrets uncovered
All hostage saved
All stages completed
500 death
1000 death
100 electrocution
Slipped into lava 100 times
Crushed 100 times
All stages cleared without dying (world 1)
All stages cleared without dying (world 2)
All stages cleared without dying (world 3)
First death
All stages completed(Factory chapter)
All stages completed(Temple chapter)
All stages completed(Jungle chapter)
Get dizzy for the first time
Caught by the boss of the factory
Finish the opening scene
Play the arcade in stage of factory chapter and complete it
First time playing the arcade in a stage
3000 death
Play the arcade in stage of Temple chapter and complete it
Watch the complete story ending
Watch the complete animation for curtain call
Play the arcade in stage of Jungle chapter and complete it